Abrading tool



L. o. BEARD 2,170,585

ABRADING TOOL Aug. 22, 1939.

Filed Aug. 8, 1938 Patented Aug. 22, 1939 I UNITED STATES PATENT OFF-ICE ABRADING TOOL Lawrence 0. Beard, Lancaster, Pa. Application August 8, 1938, Serial No. 223,774

3 Claims. (01. 51-4843) My invention relates ,to an abrading tool recesses 20 in the rear edges IQ of the abrading adapted for truing or honing hydraulic brake members I, when the latter are positioned in the cylinders and the like. slots and rest on the shims. Thus it will be seen The principal object of the invention is to prothat the shims increase the diameter of the tool vide an abrading tool adaptable for insertion in and permit the abrading members to be expanded 5 a brake cylinder and wherein means is provided further as hereinafter described. The notches to assure an efficient cutting action at the lower and dents retain the shims in position with end of the cylinder. respect to the abrading members and prevent the Another object is the provision of a tool havshims from sliding or slipping. 1 0 ing means for increasing the parallel expansion The abrading members and shims are as'semof the abrading members. bled by sliding .them along the slots 4 until the Another object is to provide abrading members tapered ends 8 and 9 engage the beveled faces having readily removable and replaceable abraof the collar I2 and retaining screw I4, and then sive means secured thereto. screwing up the nut I3 to cause the collar I2 to These and other objects and advantages Will engage the tapered ends 8, thus clamping the 1 be app nt as the spe ifi is Considered members? tightly in place. Parallel expansion t the p y ng, in. which: of the abrading members 'I is accomplished by Figure 1 is a side elevation of a tool embodyloosening the retaining screw I4 and screwin ing theainvention; I up the nut I3, in a manner readily understood.

Figure 2 s an e e View f th 1100 S o In some instances, in order 'to obtain a greater 20 n Fi ure range of expansion, two sets of relatively narrow Figure 3 s a Section 011 the line 3 of slots or grooves 4 and 4", of uniform width u e 2; but of varying depth, are formed in the shank F e 4 is a p pe View Of One Of the and into which relatively narrow fins or tongues abrading members; 1 formed on the abrading members 'I are 25 F e 5 is a enlarged p pective view of. the adapted to fit, as shown in Figure 6. Thus, the retaining screw; and alternately positioned slots 4 are relatively deep Fi re 6 s a cross section of a fie rm and the alternately positioned slots 4" are somef abrading member seated in modifiedlfelm what shallow or of a lesser depth, whereby the 39 of slot in the shank on the tool. abrading members I give a smaller diameter 30 Referring more particularly to the drawing, when placed in the deepest set of slots 4 and are wherein like reference characters designate like caused to provide a larger diameter when repa ts throughout the several views, numeral I moved from slots 4 and arranged in the shallow represents the shank of the abrading tool, which set of slots 4". When using this form of abradis formed with the smooth unthreaded portion 2 ing member it is unnecessary to provide shims or 35 and top threaded portion 3. The shank I is also backing plates, which is sometimes desirable as provided with V-shaped longitudinal slots 4, Of it reduces the number of parts, graduated depth, the upper or inner ends 5 of the Thin, flexible, metal shells or backing sheets slots being inclined relative to the axis of the M, of tin or the like, are adapted to snugly fit shank, and the side walls 6 converging with each the curved working faces 22 of the abrading other. members I, and the side edges 23 thereof are Abrading members I, V-shaped in cross secbent rearwardly and inwardly and extend into tion and of graduated depth and thickness, movgrooves or slots 24 in the sides of. the members I. ably inserted in said slots, are provided with ta- Thin sheets of emory cloth or other suitable pered end faces 8 and 9 engaged with the beveled abrasive material 25 are positioned on and end I I of a collar I2, in turn held in place by a clamped to the shells 2I by the crimped or rolled confining nut I3 screwed upon the threaded poredges 26 of the shells whereby the abrasive and tic-n 3 of the shank, and. the beveled face I5 of shells are caused to conform closely to the cona knurled retaining screw I4 which is threadedly tour of the abrading members. In addition to received in a bore I6 in the lower end of the providing a purchase for the bent edges of the shank. abrasive sheets, it will be noted that the grooves V-shaped metal shims or backing plates H, of or slots 24, in the sides of the members I, ingraduated depth, are inserted in the slots 4 and crease the thickness and depth thereof. This dents or raised portions I8 are formed thereon, is desirable in that it renders the same more 5 which dents are adapted to fit into notches or stable and substantial. A flange or rib 21 is 5 preferably formed at the upper end of each abrading member for holding the abrasive sheet in position and preventing the same from slipping or sliding off the abrading members during the grinding operation.

By virtue of the relative narrow head 28 and relatively flat bottom face 29 of the retaining screw l4, it will be readily understood that the lower ends of the abrading members 1 are only slightly spaced from the lower end of the tool. Therefore when the tool is inserted and rotated in a brake cylinder, not shown, the possibility of a burr or ridge being left at the bottom of the cylinder wall is greatly minimized.

It will of course be understood that when'the abrasive sheets 25 become worn or otherwise damaged, the same may be readily removed from their metal backing sheets 2! by simply straightening out the bent or crimped edges 26 of the latter, or if necessary, both abrasive and backing may be removed and replaced as a unit.

While better results are obtained by employing the metal shims the same may be eliminated if so desired. It is also to be understood that various changes and modifications may be made in the preferred form of tool illustrated in the drawing, without departing from the scope and spirit of the appended claims.

Having thus described my invention what I claim is:

1. An abrading tool for brake cylinders and the like comprising a shank having elongated slots of graduated depth therein, elongated abrading members of graduated depth fitting within said slots, abrading means removably superposed on said members, and means on said abrading means engageable with means on said abrading members for holding said abrading means thereon, removable means in said slots for supporting and ex panding said abrading members, and a relatively narrow beveled retaining screw means in the end of said shank for clamping said abrading members in position on the shank.

2. An abrading tool for brake cylinders and the like comprising a shank having elongated V- shaped slots of graduated depth therein, elongated V-shaped abrading members of graduated depth fitting within said slots, abrading elements removably superposed on said members, the edges of said elements being bent and adapted to fit into grooves in said abrading members whereby said elements are clamped in position thereon, V -shaped means in said slots for supporting and increasing the expansion of said abrading members, and a relatively narrow beveled screw threaded means in the end of said shank for clamping said abrading members in position on the shank.

3. An abrading tool of the character described comprising a shank having elongated V-shaped slots of graduated depth therein, elongated V- shaped abrading members of graduated depth fitting within said slots, abrading elements removably superposed on said members, the edges of said elements being bent and adapted to fit into grooves in said abrading members whereby said elements are clamped in position thereon, V-shaped means in said slots for supporting and increasing the expansion of said abrading members, and means on said V-shaped means cooperating with means in said abrading members for retaining said V-shaped means in position with respect to said members, and a relatively narrow beveled screw threaded means in the end of said shank for clamping said abrading members in position on said shank.

LAWRENCE O. BEARD. 

